RECON: TNO occultation with 08JO41

Event between 08JO41 and star UC4-550-073446 with event index number of 129275

Geocentric closest approach at 2018/07/01 18:26:17 UTC

J2000 position of star is 18:34:32.5 +19:50:11
Equinox of date position of star is 18:35:15.4 +19:51:01
Stellar brightness R=15.9
Star is 55 degrees from the moon. Moon is 89% illuminated.
TNO apparent brightness V=24.7

TNO is 41.8 AU from the Sun and 41.0 AU from the Earth.
The TNO is moving 24.4 km/sec on the sky relative to the star, or, 2.9 arcsec/hr.
The 1-sigma error in the time of the event is 350 seconds.
The 1-sigma cross-track error in the shadow position is 3016 km.

The TNO has an absolute magnitude Hv=8.4
Diameter=123.6 km assuming a 5% albedo -- 5.1 sec chord
Diameter=50.5 km assuming a 30% albedo -- 2.1 sec chord
Dynamical classification is SCATNEAR
 
 
 
 
 
 
 
 

Star training set for 08JO41, (2018/07/01 18:26UT)
Object            RA         Dec     mag  sep  mel
Vega           18:37:33.9 +38:48:06  0.0 18.96  68
Rasalhague     17:35:47.6 +12:32:53  2.1 16.04  64
110 Her        18:46:27.5 +20:33:55  4.2  2.70  54
PPM 107522     18:37:08.5 +20:01:24  7.7  0.46  55
PPM 134950     18:36:46.0 +19:53:59  8.9  0.34  55
PPM 134915     18:35:08.3 +19:33:55 10.5  0.29  55
08JO41         18:35:20.6 +19:51:07 15.9        55
Positions are for equinox of date

Azimuth is measured in degrees eastward from north. North is at an azimuth of 0, due East is at an azimuth of 90 degrees, due South is 180, and due West is 270.

Do not use the listing below for the RECON CPC 1100 telescopes. This is provided for other non-team facilities.

Star training set for 08JO41, (2018/07/01 18:26UT)
Object            RA         Dec     mag  sep  mel
Vega           18:36:56.6 +38:47:06  0.0 18.96  68
Rasalhague     17:34:56.2 +12:33:32  2.1 16.04  64
110 Her        18:45:39.7 +20:32:41  4.2  2.70  54
PPM 107522     18:36:20.5 +20:00:25  7.7  0.46  55
PPM 134950     18:35:57.9 +19:53:01  8.9  0.34  55
PPM 134915     18:34:20.1 +19:32:59 10.5  0.29  55
08JO41         18:34:32.5 +19:50:11 15.9        55
Positions are for J2000

Event circumstances last updated at 2016/07/01 17:40:49 UT

Marc W. Buie, Southwest Research Institute

RECON